Answer
Does Claude or Cursor Use VS Code as a Base?
Cursor: Yes — Directly Based on VS Code
Cursor is a fork of VS Code (Visual Studio Code). It uses VS Code's codebase as its foundation and adds AI features on top.
Evidence:
- Same keyboard shortcuts as VS Code
- Same extension marketplace (most VS Code extensions work in Cursor)
- Same settings.json format
- Same file explorer, terminal, debugger
- Cursor's own documentation describes it as "VS Code-based"
What Cursor adds on top of VS Code:
- Deep AI chat integration (Cmd+K, Cmd+L)
- Multi-file AI editing
- AI-powered autocomplete (Copilot alternative built-in)
- Codebase indexing for context-aware suggestions
- Model selection (Claude 3.5, GPT-4o, etc.)
Claude: No — Claude is Not Built on VS Code
Claude is an AI model (large language model) by Anthropic. It is not an IDE and has nothing to do with VS Code.
However, Claude is accessible within VS Code through:
- The Claude for VS Code extension (official Anthropic extension)
- Cursor (which uses Claude 3.5 Sonnet by default)
- Continue extension (open-source, can use Claude)
Claude Code (CLI): No VS Code Dependency
Claude Code is Anthropic's CLI tool — a terminal-based AI coding assistant. It:
- Runs in your terminal (not in VS Code)
- Can read/write files in your project
- Works with any editor
- Can be used alongside VS Code but is independent
bash# Install Claude Code npm install -g @anthropic-ai/claude-code # Use it (in terminal, not inside VS Code) claude "Refactor auth.py to use dependency injection"
Summary Table
| Tool | Based on VS Code? | What It Is |
|---|---|---|
| Cursor | ✅ Yes (VS Code fork) | AI-powered IDE |
| Claude (model) | ❌ No | LLM by Anthropic |
| Claude Code | ❌ No | CLI coding assistant |
| Claude for VS Code | Runs inside VS Code | VS Code extension |
| Windsurf | ✅ Yes (VS Code fork) | AI-powered IDE (Codeium) |
| GitHub Copilot | Runs inside VS Code | VS Code extension |
Why Fork VS Code?
Cursor and Windsurf fork VS Code because:
- VS Code is open-source (MIT license) — legally allows forks
- VS Code has a massive, mature codebase — no need to rebuild file explorer, syntax highlighting, debugging, terminal, etc.
- VS Code extensions work out of the box
- Developers are already familiar with VS Code's UX
Starting from VS Code lets AI IDE companies focus on the AI features rather than rebuilding a complete IDE from scratch.